Things you do are remembered better than things you read, a finding known for decades as the enactment effect. Adding movement gives the memory a second route in, through the motor system, so it has two ways to be found later. Evidence: decent
Handwritten notes beat typed ones for the same reason. Slower, and that's the point.
Same theme: Keeping the brain plastic
Keeping the brain plastic
Ask someone to explain their thing
Once a week, get someone to explain something from their world that you don't understand. Follow it properly. Ask the stupid question.
20 minEvidence: worth trying
Keeping the brain plastic
Assume you can get better at it
When you're bad at something, treat it as "not yet" rather than "not me".
no timeEvidence: worth trying
Keeping the brain plastic
Delete the brain-training app
If the goal is a sharper head, swap the app time for a real skill. The app makes you better at the app.
no timeEvidence: solid